英文:
How to make program wait for further input?
问题
如果你想让程序在等待其他问题的答案后再继续执行，你可以按照以下方式修改代码：
package main
import (
"bufio"
"fmt"
"os"
"time"
)
func main() {
scanner := bufio.NewScanner(os.Stdin)
fmt.Printf("How long did the christians walk for the crusade? :")
scanner.Scan()
input := scanner.Text()
if input == "3 years" {
fmt.Println("Correct!")
} else {
fmt.Println("Incorrect.")
return // 添加 return 语句，结束程序
}
fmt.Printf("How many of the crusades were won by christians? :")
scanner.Scan()
input = scanner.Text()
if input == "1" {
fmt.Println("Correct!")
} else {
fmt.Println("Incorrect.")
return // 添加 return 语句，结束程序
}
fmt.Printf("Who started the crusades? :")
scanner.Scan()
input = scanner.Text()
if input == "the pope" {
fmt.Println("Correct!")
} else {
fmt.Println("Incorrect.")
return // 添加 return 语句，结束程序
}
fmt.Printf("Thank you for playing!")
time.Sleep(2 * time.Hour)
}
通过在每个问题后添加 return 语句，如果答案不正确，程序将会提前结束。这样就可以等待用户输入每个问题的答案后再继续执行。
英文:
If I run the below program and enter an answer (e.g. "3 years") the program completes without waiting for any further input e.g.:
How long did the christians walk for the crusade? :3 years
Correct!
How many of the crusades were won by christians? :Incorrect.
Who started the crusades? :Incorrect.
Thank you for playing!
How can I make it wait for answers to the other questions?
package main
import (
"bufio"
"fmt"
"os"
"time"
)
func main() {
scanner := bufio.NewScanner(os.Stdin)
fmt.Printf("How long did the christians walk for the crusade? :")
scanner.Scan()
input := scanner.Text()
if input == "3 years" {
fmt.Println("Correct!")
} else {
fmt.Println("Incorrect.")
}
fmt.Printf("How many of the crusades were won by christians? :")
if input == "1" {
fmt.Println("Correct!")
} else {
fmt.Println("Incorrect.")
}
fmt.Printf("Who started the crusades? :")
if input == "the pope" {
fmt.Println("Correct!")
} else {
fmt.Println("Incorrect.")
}
fmt.Printf("Thank you for playing!")
time.Sleep(2 * time.Hour)
}
答案1
得分: 1
以上代码将接受一行输入，并将结果存储在变量input中。
所以当你的程序运行时，它会问第一个问题并等待答案；假设我回答“1天”，那么input == "1天"。在此之后，input的值不会改变-你正在将用户输入的第一个值与多个答案进行比较，即"1天" == "3年"和"1天" == "教皇"。
如果你想接受额外的行，你需要重复调用scanner.Scan()，例如：
scanner.Scan()
input := scanner.Text()
if input == "3年" {
fmt.Println("正确！")
} else {
fmt.Println("错误。")
}
fmt.Printf("十字军中有多少次是基督徒赢得了胜利？：")
scanner.Scan() // 从scanner获取下一个答案
input = scanner.Text()
if input == "1" {
fmt.Println("正确！")
} else {
fmt.Println("错误。")
}
请注意，你可以通过使用一个函数来简化这个过程：
package main
import (
"bufio"
"fmt"
"os"
)
func main() {
s := bufio.NewScanner(os.Stdin)
askQuestion(s, "基督徒为了十字军而行走了多久？：", "3年")
askQuestion(s, "十字军中有多少次是基督徒赢得了胜利？：", "1")
askQuestion(s, "谁发起了十字军？：", "教皇")
fmt.Printf("谢谢参与！")
}
func askQuestion(s *bufio.Scanner, question string, answer string) {
fmt.Print(question)
if !s.Scan() {
panic(fmt.Sprintf("扫描失败：%s", s.Err()))
}
if s.Text() == answer {
fmt.Println("正确！")
} else {
fmt.Println("错误。")
}
}
英文:
scanner.Scan()
input := scanner.Text()
The above will accept a single line of input and store the result in the variable input.
So when your program runs it asks the first question and waits for an answer; lets say I answer with "1 day" then input == "1 day". The value of Input is not changed after that point - you are comparing the first value the user enters against multiple answers i.e. "1 day" == "3 years" and "1 day" == "the pope".
If you want to accept additional lines you will need to repeat the call e.g.
scanner.Scan()
input := scanner.Text()
if input == "3 years" {
fmt.Println("Correct!")
} else {
fmt.Println("Incorrect.")
}
fmt.Printf("How many of the crusades were won by christians? :")
scanner.Scan() // Get next answer from scanner
input = scanner.Text()
if input == "1" {
fmt.Println("Correct!")
} else {
fmt.Println("Incorrect.")
}
Note that you can simplify this considerably by using a function:
package main
import (
"bufio"
"fmt"
"os"
)
func main() {
s := bufio.NewScanner(os.Stdin)
askQuestion(s, "How long did the christians walk for the crusade? :", "3 years")
askQuestion(s, "How many of the crusades were won by christians? :", "1")
askQuestion(s, "Who started the crusades? :", "the pope")
fmt.Printf("Thank you for playing!")
}
func askQuestion(s *bufio.Scanner, question string, answer string) {
fmt.Print(question)
if !s.Scan() {
panic(fmt.Sprintf("scan failed: %s", s.Err()))
}
if s.Text() == answer {
fmt.Println("Correct!")
} else {
fmt.Println("Incorrect.")
}
}
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